mineral
Likely milky quartz
Quartz, silicon dioxide (SiO₂)
AI-generated identification · may be incorrectWhite to translucent, with a glassy-to-dull luster and irregular fracture; hardness 7 on the Mohs scale, trigonal crystal structure, and no cleavage. The rough, pale surface and limited view make identification uncertain.
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Physical properties
White to translucent, with a glassy-to-dull luster and irregular fracture; hardness 7 on the Mohs scale, trigonal crystal structure, and no cleavage. The rough, pale surface and limited view make identification uncertain.
Formation & geological history
Quartz commonly crystallizes from silica-rich fluids in veins and fractures, or in igneous and metamorphic rocks; its age depends on the host geology.
Uses & applications
Quartz is used in glassmaking, electronics, abrasives, and as a decorative or lapidary material.
Geological facts
Milky quartz’s cloudy appearance usually comes from microscopic fluid inclusions or fractures.
Field identification & locations
Look for hardness sufficient to scratch ordinary glass and lack of cleavage; quartz is widespread worldwide. A small, common rough fragment like this is typically worth about $1–$10 USD.
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